JP7467462B2 - マルテンサイト鋼の製造方法及びそのマルテンサイト鋼 - Google Patents
マルテンサイト鋼の製造方法及びそのマルテンサイト鋼 Download PDFInfo
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- JP7467462B2 JP7467462B2 JP2021530858A JP2021530858A JP7467462B2 JP 7467462 B2 JP7467462 B2 JP 7467462B2 JP 2021530858 A JP2021530858 A JP 2021530858A JP 2021530858 A JP2021530858 A JP 2021530858A JP 7467462 B2 JP7467462 B2 JP 7467462B2
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- stringer
- steel sheet
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- rolled steel
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- 229910000831 Steel Inorganic materials 0.000 title claims description 136
- 239000010959 steel Substances 0.000 title claims description 136
- 229910000734 martensite Inorganic materials 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 239000002131 composite material Substances 0.000 claims description 47
- 239000010960 cold rolled steel Substances 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 37
- 238000003466 welding Methods 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 22
- 238000000137 annealing Methods 0.000 claims description 21
- 239000011572 manganese Substances 0.000 claims description 19
- 229910001566 austenite Inorganic materials 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 13
- 229910001563 bainite Inorganic materials 0.000 claims description 11
- 239000011651 chromium Substances 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 230000000717 retained effect Effects 0.000 claims description 8
- 238000004804 winding Methods 0.000 claims description 8
- 229910000859 α-Fe Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 230000001186 cumulative effect Effects 0.000 claims 1
- 238000010008 shearing Methods 0.000 claims 1
- 239000010955 niobium Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 150000001247 metal acetylides Chemical class 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 229910052758 niobium Inorganic materials 0.000 description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910000677 High-carbon steel Inorganic materials 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- -1 titanium nitrides Chemical class 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910000611 Zinc aluminium Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
- C21D2221/01—End parts (e.g. leading, trailing end)
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2251/00—Treating composite or clad material
- C21D2251/04—Welded or brazed overlays
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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Laser Beam Processing (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Arc Welding In General (AREA)
Description
- 1500MPa以上、好ましくは1700MPaを超える、より好ましくは1900MPaを超える極限引張強度、
- 1200MPa以上、好ましくは1400MPaを超える降伏強さ。
Ac3=901-262*C-29*Mn+31*Si-12*Cr-155*Nb+86*Al
式中、元素含有量は冷間圧延鋼板の重量百分率で表される。
表2は、表1の第1の鋼にマルテンサイト鋼となるために必要な機械的性質を付与するために複合コイルに実施した焼鈍方法パラメータをまとめた。鋼組成I1~I3は、本発明によるマルテンサイト鋼板の製造に役立つ。この表はまた、表でR1~R3まで指定されている参考鋼板をも明記している。表2はMs及びAc3の作表も示している。Ms及びAc3は、本発明の鋼及び参考鋼について、以下のように規定される。
Ms(℃)=539-423C-30Mn-18Ni-12Cr-11Si-7Mo
Ac3=901-262*C-29*Mn+31*Si-12*Cr-155*Nb+86*Al
ここで、元素含有量を重量%で示す。
Claims (16)
- 以下の連続した工程、
- 加熱処理されていない第1の冷間圧延鋼板のコイルを提供する工程、
- 該加熱処理されていない第1の冷間圧延鋼板のコイルの少なくとも最初の2周の外側の巻きを解く工程、
- 溶接のために該加熱処理されていない第1の冷間圧延鋼板のコイルの巻きを解かれた端部を準備する工程、
- 加熱処理されていない第1の冷間圧延鋼板のコイルの巻きを解かれた端部に、該加熱処理されていない第1の冷間圧延鋼板より炭素含有量の低い第1のストリンガー鋼を溶接して、第1のストリンガー鋼が第1の溶接部で溶接された端部を有する加熱処理されていない第1の冷間圧延鋼板のコイルを得る工程、
- 次いで、第1のストリンガー鋼が第1の溶接部で溶接された端部を有する加熱処理されていない第1の冷間圧延鋼板のコイルをリールに巻き戻して、第1のストリンガー鋼が第1の溶接部で溶接された端部とは反対の他の端部を外側の巻きとする、加熱処理されていない第1の冷間圧延鋼板のコイルを得る工程、
- その後、該加熱処理されていない第1の冷間圧延鋼板のコイルの少なくとも最初の2周の外側の巻きを解く工程、
- 溶接のために該加熱処理されていない第1の冷間圧延鋼板のコイルの巻きを解かれた他の端部を準備する工程、
- 該加熱処理されていない第1の冷間圧延鋼板のコイルの巻きを解かれた他の端部に、該加熱処理されていない第1の冷間圧延鋼板よりも炭素含有量の低い第2のストリンガー鋼を溶接して、第2のストリンガー鋼が第2の溶接部で溶接された他の端部を有する加熱処理されていない第1の冷間圧延鋼板のコイルを得る工程、
- その後、第2のストリンガー鋼が第2の溶接部で溶接された他の端部を有する加熱処理されていない第1の冷間圧延鋼板のコイルを巻取り、複合コイルを得る工程、
を含む、複合コイルを製造する方法であって、
第1の冷間圧延鋼板が重量パーセントで表される以下の元素、すなわち、
0.1%≦C≦0.4%、
0.2%≦Mn≦2%、
0.4%≦Si≦2%、
0.2%≦Cr≦1%、
0.01%≦Al≦1%、
0%≦S≦0.09%、
0%≦P≦0.09%、
0%≦N≦0.09%
を含み、以下の任意元素、すなわち、
0%≦Ni≦1%、
0%≦Cu≦1%、
0%≦Mo≦0.1%、
0%≦Nb≦0.1%、
0%≦Ti≦0.1%、
0%≦V≦0.1%、
0.0015%≦B≦0.005%、
0%≦Sn≦0.1%、
0%≦Pb≦0.1%、
0%≦Sb≦0.1%、
0%≦Ca≦0.1%
の1種以上含むことができ、残余の組成は鉄及び加工に起因する不可避の不純物から構成され、
第1のストリンガー鋼及び第2のストリンガー鋼が、重量パーセントで表される以下の元素、すなわち、
0.001%≦C≦0.25%、
0.2%≦Mn≦2%、
0.01%≦Si≦2%、
0.01%≦Cr≦1%、
0.01%≦Al≦1%、
0%≦S≦0.09%、
0%≦P≦0.09%、
0%≦N≦0.09%
を含み、以下の任意元素、すなわち、
0%≦Ni≦1%、
0%≦Cu≦1%、
0%≦Mo≦0.1%、
0%≦Nb≦0.1%、
0%≦Ti≦0.1%、
0%≦V≦0.1%、
0.0015%≦B≦0.005%、
0%≦Sn≦0.1%、
0%≦Pb≦0.1%、
0%≦Sb≦0.1%、
0%≦Ca≦0.1%
の1種以上を含むことができ、残余の組成は鉄及び不可避の不純物から構成される、方法。 - GMAW、TIG、MIG、レーザー溶接又はアーク溶接からの溶接方法のいずれか1つにより、溶接が行われる、請求項1に記載の方法。
- 前記第1のストリンガー鋼、前記第2のストリンガー鋼、及び前記加熱処理されていない第1の冷間圧延鋼板の幅が同一である、請求項1又は2に記載の方法。
- 少なくとも加熱処理されていない第1の冷間圧延鋼板並びに少なくとも第1のストリンガー鋼及び第2のストリンガー鋼を含んで成る複合コイルであって、該第1のストリンガー鋼と該加熱処理されていない第1の冷間圧延鋼板の端部とは第1の溶接部で溶接されており、該第2のストリンガー鋼と該該加熱処理されていない第1の冷間圧延鋼板の他の端部とは第2の溶接部で溶接されており、
第1の冷間圧延鋼板が重量パーセントで表される以下の元素、すなわち、
0.1%≦C≦0.4%、
0.2%≦Mn≦2%、
0.4%≦Si≦2%、
0.2%≦Cr≦1%、
0.01%≦Al≦1%、
0%≦S≦0.09%、
0%≦P≦0.09%、
0%≦N≦0.09%
を含み、以下の任意元素、すなわち、
0%≦Ni≦1%、
0%≦Cu≦1%、
0%≦Mo≦0.1%、
0%≦Nb≦0.1%、
0%≦Ti≦0.1%、
0%≦V≦0.1%、
0.0015%≦B≦0.005%、
0%≦Sn≦0.1%、
0%≦Pb≦0.1%、
0%≦Sb≦0.1%、
0%≦Ca≦0.1%
の1種以上含むことができ、残余の組成は鉄及び加工に起因する不可避の不純物から構成され、
第1のストリンガー鋼及び第2のストリンガー鋼が、重量パーセントで表される以下の元素、すなわち、
0.001%≦C≦0.25%、
0.2%≦Mn≦2%、
0.01%≦Si≦2%、
0.01%≦Cr≦1%、
0.01%≦Al≦1%、
0%≦S≦0.09%、
0%≦P≦0.09%、
0%≦N≦0.09%
を含み、以下の任意元素、すなわち、
0%≦Ni≦1%、
0%≦Cu≦1%、
0%≦Mo≦0.1%、
0%≦Nb≦0.1%、
0%≦Ti≦0.1%、
0%≦V≦0.1%、
0.0015%≦B≦0.005%、
0%≦Sn≦0.1%、
0%≦Pb≦0.1%、
0%≦Sb≦0.1%、
0%≦Ca≦0.1%
の1種以上を含むことができ、残余の組成は鉄及び不可避の不純物から構成され、
当該複合コイルの溶接部は70%を超える溶接靭性を有し、
当該複合コイルの溶接部は12サイクルを超える溶接曲げ性を有する、
複合コイル。 - 前記複合コイルの溶接部が14サイクルを超える溶接曲げ性を有する、請求項4に記載の複合コイル。
- 少なくとも70%のマルテンサイト及び1500MPaを超える引張強さを有するマルテンサイト鋼板を請求項1に記載の方法により製造された複合コイルから製造する方法であって、以下の連続した工程、すなわち、
- 請求項1に記載の方法により製造された複合コイルを提供する工程、
- 次いで、該複合コイルを2℃/秒を超える速度でAc1~Ac3+100℃の間の均熱温度まで加熱し、そこで10秒間~500秒間保持することにより、焼鈍を行う工程、
- 次いで、該複合コイルを25℃/秒を超える速度でMs温度未満の温度まで冷却し、温度範囲150℃~400℃の間で10~1000秒間の時間の間複合コイルを保持する工程、
- 該複合コイルを室温まで冷却した後、剪断切り取り作業を行い、第1のストリンガー鋼及び第2のストリンガー鋼を除去してマルテンサイト鋼板を得る工程、
を含む方法。 - マルテンサイト鋼板が重量百分率で示される以下の元素、すなわち、
0.1%≦C≦0.4%、
0.2%≦Mn≦2%、
0.4%≦Si≦2%、
0.2%≦Cr≦1%、
0.01%≦Al≦1%、
0%≦S≦0.09%、
0%≦P≦0.09%、
0%≦N≦0.09%
を含み、以下の任意元素、すなわち、
0%≦Ni≦1%、
0%≦Cu≦1%、
0%≦Mo≦0.1%、
0%≦Nb≦0.1%、
0%≦Ti≦0.1%、
0%≦V≦0.1%、
0.0015%≦B≦0.005%、
0%≦Sn≦0.1%、
0%≦Pb≦0.1%、
0%≦Sb≦0.1%、
0%≦Ca≦0.1%
の1種以上含むことができ、残余の組成は鉄及び加工に起因する不可避の不純物から構成され、該マルテンサイト鋼板の微細組織は、面積百分率により残留オーステナイト及びベイナイトの累積存在を0%から25%の間で含む微細組織を有し、残余の微細組織は少なくとも70%のマルテンサイトであり、0%~10%の間のフェライトの任意の存在を有する、請求項6に記載の方法。 - 組成が0.4%~1.8%のケイ素を含む、請求項7に記載の方法。
- 組成が、0.2%~0.4%の炭素を含む、請求項7又は8に記載の方法。
- 組成が0.01%~0.5%のアルミニウムを含む、請求項7~9のいずれか一項に記載の方法。
- 組成が0.2%~1.5%のマンガンを含む、請求項7~10のいずれか一項に記載の方法。
- 組成が0.2%~0.8%のクロムを含む、請求項7~11のいずれか一項に記載の方法。
- マルテンサイトが85%以上である、請求項7~12のいずれか一項に記載の方法。
- 残留オーステナイト及びベイナイトの和が1%~10%の間である、請求項7~13のいずれか一項に記載の方法。
- 前記マルテンサイト鋼板が1700MPa以上の極限引張強度及び1000MPa以上の降伏強さを有する、請求項7~14のいずれか一項に記載の方法。
- 車両の構造部品を製造するための、請求項6~15に記載の方法に従って得られるマルテンサイト鋼板の使用。
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